MEDIUM 6.3 NVD
CVE-2026-57511
SuperPlane before 0.30.0 contains an SMTP header injection vulnerability that allows unauthenticated attackers to inject arbitrary SMTP headers by including CRL
SuperPlane before 0.30.0 contains an SMTP header injection vulnerability that allows unauthenticated attackers to inject arbitrary SMTP headers by including CRLF sequences in the event payload title field delivered via webhook. Attackers can manipulate the unsanitized title field passed to the SMTP DATA command to add Bcc recipients for content exfiltration, forge the From address to bypass SPF and DKIM checks, or inject Content-Type and MIME boundary headers to corrupt message bodies for phishing.
References
- https://github.com/superplanehq/superplane/commit/428c559dd2fa0aef3ba825a434a1b05c9abc7df7
- https://github.com/superplanehq/superplane/pull/6354
- https://github.com/superplanehq/superplane/releases/tag/v0.30.0
- https://www.vulncheck.com/advisories/superplane-smtp-header-injection-via-webhook-event-ti
This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-07-28 via NVD.
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